Hello Doctor, i am a 19 year old that has eczema...

Treatment of Rashes : 
Treatment depends on the cause. To detect the cause, a medical examination and a specialist’s consultation must be performed. For treatment, we recommend staying away from allergens, and wearing loose cotton clothes to reduce friction. Moisturizing creams can be used on the affected area. If the cause is an allergy, Betamethasone ointment is used twice daily, and in In the presence of infections, the antibiotic Bacitracin is used twice daily, and an antihistamine such as Loratadine 10 mg can be used once daily to relieve symptoms.
Diagnosis : 
By taking the medical history, doing a clinical examination, doing a blood test (CBC) to detect infections, doing a skin allergy test, and taking a skin biopsy to detect the causes
Causes : 

• skin allergies
• bacterial dermatitis
• eczema
• fungi

Advice : 
you should go to the Dermatologist to get proper managment