“What causes an arm rash?”

A rash on your arm can happen for many reasons, like:

Allergies (to food, plants, soap, or lotion)
Skin irritation (from sweating, rubbing, or tight clothes)
Eczema (dry, itchy, red skin)
Psoriasis (scaly, rough patches)
Heat rash (tiny bumps from sweating)
Infections (from bacteria, fungus, or viruses)
Contact with something irritating (like poison ivy or chemicals)
Since your rash has lasted 14 days, it’s best to see a skin doctor to find out what it is and how to treat it.

Visit Irvine Skin and let Dr. Parvin Shafa check your rash and give you the right treatment. Book your appointment today!

Call us at (949) 551-1113
Our Address: 113 Waterworks Way 100, Irvine, Orange County, CA, 92618, United States.

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Hard to say. Differential diagnosis includes and area that you are picking at or even a squamous cell cancer. As far as a rash, all I see is one blurry lesion. Sorry I can’t be of more help. I’d have that checked by a board certified dermatologist.

Warm regards,

Not sure. But could be spider bites. Definitely looks as if something from outside irritated the skin.

Looks like you have a crusted area on your arm, probably caused by scratching. To find out what is causing the itch, best to visit a local dermatologist. 

Stephen Schleicher, MD