Work out acne severity grade instantly with clear inputs, formula shown and shareable results.
Grades acne from lesion counts using the conventional four-grade scheme, where any nodules raise the grade and drive scarring risk.
Lesion count grading
Grade 1 comedonal; grade 2 15-50 inflammatory lesions; grade 3 nodules present; grade 4 more than 5 nodules, over 100 comedones or over 50 inflammatory lesions
Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
Nodular and cystic lesions cause permanent scarring, which is why they push treatment towards systemic therapy.
Only moderately between observers, which is why global assessment scales are also used in practice.