on face with a white center raises the possibility of fungal infection( if it is itchy) or granuloma annulare. It is characterized by round bump or rash appearing on the joints or back of hands. No treatment is required and it may go on its own. Severe cases may need steroids, non-steroid topical anti-inflammatory creams such as tacrolimus, cryotherapy, laser treatment or UV light therapy. Consultation of a dermatologist will be the best in your case because the diagnosis has to be confirmed first.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your dermatologist. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.