Abstract
A precise and reliable assessment of acne severity is unarguably the most essential
clinical method when it comes to monitoring and choosing optimal treatment in the
daily practice. Since the early 1960s, different severity assessment systems have
been described in the literature. The two commonly used concepts are global gradings
and lesion counting. Both systems have been controversially discussed as to which
is more reliable and providing an objective outcome measurement tool; however, both
have some subjectivity involved. More objective methods for assessing the severity
of acne vulgaris include photography, fluorescence photography, polarized light photography,
video microscopy, and multispectral imaging. Such techniques have limitations such
as high cost, complex and sophisticated apparatus, and a sometimes time-consuming
imaging process. There are newly developed technologies that could avoid the problems
of inter- and intrarater subjectivity.
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