As per your symptoms it may be allergic dermatitis or other skin problems without proper examination can't access the diagnosis.. First of all avoid the food which is sour, spicy, oily, junk foods, drink more water..
Early morning drink turmeric 1/2 tsp mixed with warm water in the empty stomach.
Apply the paste of tulasi +turmeric +bacopa moneria plant leaves over the affected area
Next Steps
if no relief consult Ayurveda physician for virechana therapy followed by internal medication
Health Tips
treatment should be continued for 2months for complete cure