N-(pyrid-4-yl)amides and N-(pyrimidin-4-yl)amides of formula (1) are described that are potent modulators (e.g., inhibitors) of an androgen receptor, and which are useful, for example, in the treatment of a dermatological disease or disorder; a disease or disorder of the sebaceous gland(s); acne; hyperseborrhoea; oily skin, seborrhoeic dermatitis; hyperpilosity or hirsutism; atopic dermatitis; or androgenic alopecia; especially acne. Also described, are compositions (e.g., pharmaceutical compositions, cosmetic compositions) comprising the compounds; methods of preparing the compositions; methods of modulating (e.g., inhibiting) and androgen receptors using the compounds and/or compositions; and medical and/or cosmetic use of the compounds and compositions.