hi..thanks for your query.
The first thing that is advisable in your case is to do a few blood tests to determine the immune status of your body.most important ones should be Diabetes
Fungal infections should be treated with Topical Clotrimazole
Cream twice daily on the affected areas.oral anti- histaminics may be required to reduce itching , if any.The 'blotches' after bath may be a manifestation of Urticaria
and might require prolonged treatment as well.
Please consult your dermatologist
for a complete check up and therapy .
Hope this helps..take care.