Sometimes even dermatologist is not a enough to treat adult acne as this skin condition is often caused by sensitivity for androgen along the jawline. Minor changes or fluctuations in estrogens for women result in androgen dominance which causes increased oil production along jawline and characteristic inflamed Acne lesions.
Dermatologists are often prescribing antibiotics which can reduce the bacterial flora and inflamation but it will never help to treat a cause of Adult Acne: hormonal imbalance. Cooperation between dermatologist and endocrinologist seams to be the best way to treat that skin condition.
You can also try Skin-Accumax, new revolutionary solution for Acne and Rosacea. I seen a great results after one month treatment and a really big improvement in skin condition (even very inflamed Acne improved very much). You can buy Skin-Accumax from my website http://www.blackdiamondbeauty.co.uk/BEAUTY-SHOP.html
I recommend also Exfoliating Cream with Pyruvic, Azelaic & Salicylic Acid from Bandi, which helped to reduce Acne and also reduce scars and discoloration for tens of my clients. It is available to buy from my website, too.
Also Butterfly Effect treatment (with Pyruvic, Azelaic and Salicylic Acid) improving skin very much but due to a summer I stopped to perform that treatment now and I am going to start it again in a middle of September.
But you must remember the real cause of Acne are your hormons.
I recommend to use in your diet and skin care oils rich in GLA (Gamma-linolenic Acid), cold pressed Hemp oil, Evening Primrose oil, Borago oil to reduce inflamation and stabilize your hormons a little bit.
If you have more question about Acne please do not hesitate to email me firstname.lastname@example.org