Hello,
These black patches can be due to fungal infection, eczema skin( less likely as it is red itchy, dry patches rather than black) or erythrasma. Erythrasma is characterized by well-demarcated, brown-red macular patches. The skin has a wrinkled appearance with fine scales.
It has to be differentiated from contact dermatitis, psoriasis, sweat dermatitis and fungal infections which may mimic it. Wood lamp examination and gram staining are the tests for its diagnosis. I hope it helps. Take care and regards.
I am requesting this post be moved to the dermatology forum but I do have an answer for you. My husband has these same spots, and they do itch in winter and sometimes summer also. The spots are called Tinea versicolor. Tinea versicolor in aggravated in humid locations, most often winter because we wear warmer clothes that hold in moisture. In summer, because it is hot and humid outside, which promotes the increase of itching. The Tenia is a fungus, which is not contagious. It happens on anyone, and is easily treated with Selson Shampoo. Or any dandruff shampoo that indicates on the bottle that it can be used for Tenia. You should speak with your doctor, to make sure this is what it is. You can also speak with a pharmacist who can suggest with shampoo you can use on those spots. When you use the shampoo, lather it on the area for two minutes then rinse.
Hopefully this should help.
In addition to anything I have mentioned, please keep in mind, that while I or others may have extensive knowledge in many areas, you should always seek professional medical advice from your own physician, as it pertains to medical conditions or concerns.
Good luck, and if you have any other questions that I can help you with, please feel free to message me directly.
Sincerely,
Sandi (Dragon1973)
MedHelp Genetics Community Leader;
Children - Special Needs Community Leader;
Down syndrome Community Leader & Ds Group Forum Founder/Moderator
You need to see a Dermatologist to determine exactly what this is and to get the proper treatment. Eczema is not black.