Fig (1) Clinical features of acne vulgaris. (a) Acne type 1 lesion (b) Acne type 2 lesion (c) Acne type 3 (d) Acne type 4 Acne type 1, mildly inflamed papular lesions Acne type 2, moderately inflamed, pink papules Acne type 3, fully blown inflamed, red papulopustules Acne type 4, deep-seated papules or nodulocystic.