Thanks for posting on HCM
Yes you should go to the dermatologist
From the description of symptoms you are most likely having a skin infection
probably due to fungi. Treatment is topical antifungi agents like miconazole
cream or ketokonazole cream etc.
Another possible cause of your skin affection might be allergic reaction
but of unknown cause. Usually rare as something usually triggers the reaction.
A dermatologist will have to look at the skin lesions and determine the type of affection you are presenting.
Hope this helps