Spots like you describe can be seborrheic dermatitis (an inflamed form of dandruff), an allergic contact dermatitis, particularly if you applied something new to the hair or scalp or an infection like ringworm or even bacterial infection, although bacterial infection is usually centered around the hair follicle and looks more like a painful bump than a coin-sized patch.
NOTICE: The information provided on this site is not a substitute for professional medical advice,
diagnosis, or treatment. Never delay or disregard seeking professional medical advice from your
physician or other qualified health provider because of something you have read on Wellsphere.
If you have a medical emergency, call your doctor or 911 immediately.