How can I treat painful chest and back pimples?

There is no permanent cure for acne. acne is the continuous process because of the oil glands in the skin that are more sensitive and reacting to the hormones in your body that might fluctuate or might be in abnormal quantity, that result in more oil secretion on the seborrheic areas like face and chest, that is resulting in bumps or impulse. If you are getting relief by the treatment, you have to continue some sort of treatment even after acne is gone like no oiling of the face, use anti dandruff shampoos, use salicylic facewash, avoid using thick creams, use topical agent for management of acne, increase water intake, avoid high calorie diet and exercise regularly.

Have in mind that Omniclav 625 and Oflox oz are antibiotics. The accurate methods to use it are necessarily by doctor's prescription. Waiting 1 hour before taking the other may not be the best idea. You should take care of following the directions to their specified methods of administration. 

If its only acne marks, continuing your acne treatment with facewash and gels will improve it. Some topical agents also helps in removing the pigmentation and marks of the acne. Even Salic acid 20% gel at night on spots is helpful. Glyco 6 or Glycolic acid 6% is recommended for application on the face. Acne compatible sunscreen is also helpful. Chemical Peeling with glycolic acid or salicylic acid is useful

The fine lines and dullness can occur due to the aging process and sun exposure. The under-eye bumps may be milia or small cysts. Dark circles can be caused by lack of sleep or genetics. Open pores are usually associated with oily skin. You can use gentle exfoliants, retinol creams, eye creams, and skin-tightening serums to help these issues. 

Nightfall or wet dreams are common and normal phenomena for unmarried young people. It occurs precisely because your body is generating hormones. Having it happen twice a month can't be a cause for alarm most of the time. To minimize the frequency of such occurrences, avoid stimulating activities before bed, keep yourself busy during the day, and maintain a healthy lifestyle with regular exercise and a balanced diet.