Good Evening,
Thanks for given information,spot on you arm caused by
keratosis pilaris, a common skin condition that usually affects the arms and thighs (although it sometimes appears on the buttocks and face, too). It's caused by a buildup of the protein keratin, which can plug a hair follicle, resulting in a bump.
Some simple things can help keep your skin comfortable.
Don't scratch at the bumps or rub your skin roughly.
Use warm water rather than hot for bathing and showering.
Limit your time in the water.
Try soap that has added oil or fat.
Use thick moisturizers generously on the skin.
Add moisture to the air in your home with a humidifier.
Topical exfoliants remove dead skin cells from the surface of your skin. These include creams that contain alpha-hydroxy acid, lactic acid, salicyclic acid, or urea.
This Might be helpful to relief your symptoms
Thanks for consult,
Regards,
Dr,Naeem. MD