It's hot and your face is breaking out. Alpha Hydroxy Acids (glycol, lactic and citric) and beta hydroxy acid (namely salicylic) should be your skin care staples. BHA (beta hydroxy acid) salicylic acid is an exfoliant that penetrates deep into the skin's layers encouraging the pores to unclog. It's able to break down the things that clog your pores like dead skin cells, dirt and excess oil. It's also a great anti-inflammatory which is why you find it in acne treatments.
Citric acid is in the AHA group but unlike BHA they are only able to penetrate the top layer of the skin. AHA make a good choice for sloughing off the dead cells from the skin's surface. Glycolic Acid is one of the two most popular chemical exfoliant used in peelers and toners. It's a much smaller molecule size so it can penetrate a lot deeper. Sensitive skin types might find it harsh and irritating so it's best to introduce it in a small concentration first.
Lactic Acid another AHA is substance naturally found in milk. It is more moisturizing than glycol acid making it a better choice for sensitive skin. With all acid products make sure you use sunscreen and apply it every hour if in water and limit sun exposure.