Hi, The treatment much depends on the causes of dehydration, your body type and type of pimples. However for inflammation and pain, I can suggest some Ayurvedic home remedies which are safe and effective. Dashmooladi kwath 10 ml early morning empty stomach. Avoid food for 30 mins after taking the medicine. Apply chandan paste/jivantiyadi cream if available. Triphala 1 tsp with warm water before bed at night. Follow this till the inflammation subsides. This is a general body detoxification which will help without any side effects. Hope this helps!