<prompt> Ceruloderma is characterised by-Excess melanin in dermis , pigmentation not accentuated under Woods lampExcess melanin in basal and suprabasal layers, pigmentation accentuated under Woods lampIncreased epidermal and dermal melaninExcess melanin in basal and suprabasal layers, pigmentation not accentuated under Woods lamp  <response>: Ceruloderma- Due to defect in migration of melanocyte. Melanocyte derived from neural crest and migrate to stratum basale epidermis Defect in migration of melanocytes due to which they remain in dermis Eg. Of Ceruloderma - 1. Mongolian spot 2. Nevus of OTA3. Nevus of ITO Clinical features - Dermis- Blue lesion - Dont become dark under woods lamp . Blue dt - Tyndall effectoptical effect i.e. paial scattering of light Most of light reflected back is blue in colour. 