What's Causing My Rash

Wondering when a rash is a cause for concern?

We’re all going to deal with a rash at some point, and while the good news is that many of them can be treated from the comfort of your own home, sometimes you will need to turn to a dermatologist for medication. Here are the causes of a rash,

Fungal Infection

One of the most common fungal infections that result in a rash is ringworm. Fungal infections can also affect the nails and hair. Yeast infections caused by the candida fungus can also result in rashes of the mouth, groin, or vagina. Less common fungal infections may result in those with compromised immune systems (e.g., patients who have HIV).

Minor fungal infections may be treated with over-the-counter anti-fungal creams or ointments. A dermatologist should treat more severe or persistent fungal infections.

Viral Infection

The most common virus to produce a rash is the herpes simplex virus, both type 1 and type 2. Type 1 usually causes cold sores of the lips and nose, while type 2 leads to sores on the genitals. Those with an HSV flare-up may develop a tender rash on the palms. Chickenpox and shingles (caused by the herpes zoster virus) also result in itching, burning, and painful rashes.

Epstein-Barr virus, best known as mononucleosis or “mono,” can also lead to a mild rash that appears within a few days of being infected. If you develop a rash, a sore throat, swollen lymph nodes, and a fever, you should see a doctor.

Bacterial Infection

Staphylococcus (e.g., folliculitis; cellulitis; impetigo) and streptococcus (e.g., strep throat; scarlet fever) are two common bacterial infections that lead to a rash. Sometimes Lyme disease is characterized by a bull’s eye-like rash surrounding the tick bite.

Parasitic Infections

Parasites that cause a rash include lice and scabies, which can be passed from person to person. Lice most commonly affect the scalp, while scabies can cause an itchy, pimple-like rash that usually appears on the armpits, wrists, elbows, beltline, and buttocks.

Other Causes

Noninfectious rashes are also caused by drugs, eczema (e.g., atopic dermatitis), allergic dermatitis, autoimmune disorders (e.g., lupus), and food allergies.

It isn’t easy to tell what’s causing your rash, but if you are dealing with new, worsening, or severe symptoms or the rash is spreading, it’s always good to turn to your dermatologist for treatment.