I am suffering from ringworm since june 2020. I...

What is the treatment of ringworm ?
In your case it's really important to keep good hygiene by daily washing the affected area and keeping it dry and clean and wear comfortable clothes , and yu can use antifungal soap , with Topical cream to relieve the 
 symptoms such as betacare cream and clotrimazole 3 times /day 

How to diagnose ?
your condition can be diagnosed simply by clinical assessment 

What are the causes ?
Warm weather 
Wetness and humidity 
Tight clothes 
poor hygiene 
weak immune system 
Advice:
dermatologist consultation