The Inkey List Succinic Acid Blemish Treatment (£7) got a lot of hype when it first launched because it contained an ingredient we hadn't heard of before. Succinic acid has been used in medical circles for years. It's naturally found in amber, where its antimicrobial properties have been used for centuries in therapeutics. Recently, however, studies have shone a light on its amazing properties like skin reconditioning and soothing irritation, which it does in this product. Thing is, this little tube also contains salicylic acid and sulphur, two well-known spot zappers — the former by helping to clear out clogged pores and the latter by sopping up excess oil.