Medically reviewed by Susan Bard, MD Some causes of underarm rash include infection, allergic reaction, and inflammation.

Armpit rashes are common in summer and require a combination of remedies and treatments Here’s what an expert has to say ...

Instead, inverse pityriasis rosea affects the armpits or groin ... looks similar to an inverse pityriasis rosea rash include psoriasis, the fungal infections tinea corporis and tinea versicolor ...

A ringworm rash can be uncomfortable ... you should wash your clothes and sheets daily to eliminate the infection faster. Fungal spores can transfer to your sheets and comforter.