Dermoscopic evaluation of pigmented skin lesions using the three-point checklist algorithm: Melanoma in situ and pigmented basal cell carcinoma

The three-point checklist uses three criteria (asymmetry, atypical network, and blue-white structures) and assigns one point to each. A score of ≥2 is considered positive.
(A) Melanoma in situ revealing an atypical network and asymmetry of pattern and distribution of dermoscopic structures. Using the three-point checklist, this lesion has a total score of 2 points, which is considered positive, and should be removed and submitted for histopathologic evaluation.
(B) Basal cell carcinoma: Under dermoscopy, blue-white structures (ie, blue-white veil) and asymmetry of pattern and distribution of dermoscopic structures are seen. Using the three-point checklist, a total score of 2 points is obtained; thus, it should be removed or submitted for further evaluation.