Red streaks or lines on the skin refer to linear red marks. Self-scratching is a common cause but there are skin rashes or conditions which can also lead to red lines on the skin.
Some may resolve on their own, however, some like red streaks due to an infection require timely treatment.
If you are not sure what is causing the red lines on your skin, it’s best to see a doctor for diagnosis and treatment.
Below you will find 9 possible causes of red streaks or lines on the skin.
1. Self-scratching
Self-scratching is one of the common causes of red lines on the skin. Scratching can be triggered by several factors:
- Dry skin.
- Eczema.
- Allergic reaction.
- Other skin rashes like ringworm, and psoriasis.
- Insect or bug bites
- Scabies.
Treatment and Prevention
To avoid red lines due to scratching, the following measures may be helpful:
- Keep your fingernails trimmed.
- Moisturize your skin and avoid long hot baths.
- If you have an underlying medical condition like eczema or psoriasis, treat it.
- For scabies, use topicals with scabicides and decontaminate your clothes and bedding.
- Use bug-repellent spray or full-length clothes when you go outdoors in the woods.
2. Scratches from pets
It is not uncommon to get scratches from the pets in the house. In addition, the pets can bring fleas or other bugs which can bite and lead to self-scratching.
To avoid these, keep the pets out of the beds especially when you are sleeping to avoid accidental scratches. If your pet has any infestation or infection, get them treated.
3. New stretch marks
Raised red lines on the skin that may be itchy can be due to newly formed stretch marks.
Stretch marks are linear streaks that can develop due to several causes like sudden weight gain, weight loss, pregnancy, system diseases like excess cortisol, or genetics.
Stretch marks can be of different colors. The newly developed stretch marks often appear as slightly raised red streaks (red stretch marks). The commonly affected areas are the abdomen, thighs, buttocks, breasts, arms, and lower back.
Stretch marks develop due to tears in the dermis of the skin which damages the collagen and elastic fibers. This is accompanied by increased blood flow and inflammation.
Treatment
The stretch marks respond best to treatment when they are newly formed. Topicals have limited efficacy, however, the ingredients that can be useful include retinoids, hyaluronic acid, and Centella Asiatica extract.
The stretch marks may also be treated with several in-office procedures done by a trained professional. These include lasers, micro-needling, chemical peels, and microdermabrasion.
4. Dermatographia
Red lines on the skin that look like scratches may be due to dermatographia.
Dermatographia is a condition in which light scratching, rubbing, or pressure can lead to raised red lines within minutes. These red lines usually disappear in 30 minutes. This condition most commonly affects the trunk and extremities.
It is also referred to as skin writing and affects 2-5% of the population.
The exact cause behind this is not known. However, it is thought that histamine release from mast cells (a type of allergy cell) may play some role.
Treatment
The red streaks due to dermatographia disappear on their own. In some cases, your doctor may recommend antihistamines such as loratadine and cetirizine. Another drug, omalizumab, is still being researched for this condition.
To prevent this, one should avoid factors that cause it like physical stimuli.
5. Telangiectasia (Spider veins or broken blood vessels)
Red lines on the face or legs that won’t go away can be due to telangiectasia (also called broken blood vessels or spider veins).
Telangiectasias are dilated and enlarged blood vessels just under the surface of the skin. They are commonly seen on the face (especially on cheeks and nose) and legs. They appear as small red lines in a web-like or branching pattern.
These can occur due to various reasons which include genetics, rosacea, sun exposure, trauma, pregnancy, or chronic irritation.
Treatment
Topicals have limited efficacy in getting rid of red lines due to broken blood vessels. Retinoids like retinol may help make them less prominent in some individuals.
Some of the effective treatment options include laser, intense pulsed light therapy (IPL), and sclerotherapy.
In addition, the following measures may be helpful in preventing and worsening broken blood vessels:
- Always protect your skin from the sun.
- Be gentle with your skin and use products meant for sensitive skin.
- Do not use hot water to take a bath.
- Avoid exposing your skin to extreme heat.
- If you have spider veins on your legs: Elevate your legs and use compression stockings.
6. Poison ivy rash
Poison ivy rash is an allergic reaction to an oily resin (urushiol) that is present in leaves, roots, and stems of poison ivy, poison sumac, and poison oak.
Often the leaves can brush against the skin surface leading to red streaks or lines within hours of contact. These may be accompanied by itching, blister formation, and swelling.
Treatment
One should immediately wash the area of contact to remove any oily resin residue. The rash usually clears on its own in 2-3 weeks.
Cool compress and calamine lotion may help in relieving itching. For severe reactions, your doctor may recommend oral steroids.
7. Lymphangitis
Red streaks or lines on the skin can be due to an infection called lymphangitis, which is sometimes mistakenly referred to as ‘blood poisoning’, a common term for sepsis.
Lymphangitis refers to the inflammation of the lymphatic system (the lymphatic system consists of vessels, nodes, and tissues that help our body in fighting infections). The common culprit is streptococcal infection.
Lymphangitis may also be caused by staph (staphylococcal) infection. The bacteria can enter through a cut or wound or may be present due to a preexisting skin infection.
Lymphangitis can lead to red streaks on the skin which often extend from the wound or area of infection to the nearest group of lymph nodes. These streaks may be warm and tender to the touch.
One may also have other accompanying symptoms like fever, chills, fatigue, headache, and swollen lymph nodes.
If the red line or streak on the skin is growing in length, it may be a sign of sepsis: a serious complication of lymphangitis.
Treatment
The treatment of lymphangitis should be started early to avoid complications such as sepsis. The treatment may include antibiotics, pain medications, and anti-inflammatory medications.
8. Jellyfish stings
Raised red lines on the skin, which may appear after spending time in water bodies such as beaches where jellyfish are common, could be due to a jellyfish sting.
Jellyfish have finger-like structures called tentacles which have stinging cells called nematocysts. You can get a sting if you brush against these tentacles.
The symptoms will depend on the type of jellyfish. Some can lead to mild symptoms like itching, burning, red streak from contact with the tentacle, blister formation, and swelling while some like box jellyfish can lead to more severe reactions like muscle pain, dizziness, difficulty breathing, or chest pain.
Treatment
If you have a severe reaction, you should see a doctor right away. For milder reactions, rinse the area with seawater (not freshwater) and remove the visible tentacles with a tweezer.
Do not try to scrape off the tentacles. If needed, hydrocortisone cream can be applied to reduce swelling and pain.
9. Flagellate erythema
Flagellate erythema can lead to red lines on the skin which may look like scratches. This is an uncommon skin rash that presents with red streaks, usually on the back and flanks. This can resemble marks left by the whiplash. These are often accompanied by itching.
It is associated with bleomycin and other anticancer medications, Shiitake mushroom intake, dermatomyositis, lupus, and Still disease.
In comparison to dermatographia which appears after physical stimuli, flagellate erythema appears spontaneously.
Treatment
The rash usually resolves on its own. Antihistamines can help in relieving itching. In some cases, the underlying cause may need to be addressed.
Key points
Red lines or streaks on the skin can often be due to scratching from dryness, itchy rashes, or bug bites. Dermatographia is a condition that can lead to red lines which can look like scratch marks, with minimal rubbing or pressure.
In some cases, a rash may present with red lines like poison ivy rash and flagellate erythema. Red lines in a branch-like pattern can be due to broken vessels whereas red lines which are thick and slightly elevated can be due to stretch marks.
One should see a doctor if red lines on the skin are accompanied by systemic symptoms like difficulty in breathing (may be a sign of severe allergic reaction), fever (may be a sign of infection like lymphangitis), or dizziness. In addition, if you have severe pain or visible discharge, you should get medical attention.
References
- Bhushan P, Manjul P, Baliyan V. Flagellate dermatoses. Indian J Dermatol Venereol Leprol 2014;80:149-152. Link: https://ijdvl.com/flagellate-dermatoses/
- Flagellate erythema. Tallon B. 2007. DermNet. Link: https://dermnetnz.org/topics/flagellate-erythema
- Lidia Maroñas-Jiménez, MD, Alejandro Lobato-Berezo, MD, Ramon Pigem, MD, Diana Menis, MD and Sara Palencia-Pérez, MD, PhD. Whiplash-shaped acute rash. Clinic Journal of Medicine June 2016, 83 (6) 417-418.
- Nobles T, Muse ME, Schmieder GJ. Dermatographism. [Updated 2023 Feb 20]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2023 Jan.
- Jellyfish sting. Cleveland Clinic.
Disclaimer: This article is for information purposes only and does not replace medical advice.