- Once clinical photography is done dermoscopy images should be obtained particularly when the diagnosis is unknown.
Practical things to take dermoscopy photographic imaging:
- Include some normal skin to contrast, at a ratio of 25/75: 25 of normal skin and 75 of affected skin.
- If the lesion or the rash occupies a small surface, then make sure that the rash is in the center and not displaced at the periphery.
- Always get a non-contact polarized image first, because that will actually give you the vessel arrangements, which are really important for making a diagnosis when diagnosing a rash.
- Then follow up by polarized contact, then non-polarized images, which can actually give display epidermal changes and scaling, things like that better.
- Make sure to get some complimentary views when photographing rashes such as bilateral anatomical topography mapping: for example if the left elbow is involved, make sure to include the picture of the right elbow.
- If the rash is large and it has different morphologies, make sure to take multiple dermoscopy images.
- If capturing dermoscopy images for a lesion on the mucosa, whether it is mouth or the genital area or perianal area, these dermatoscopes come with a disposable “cap” : which are for single use.
Reference: Trilokraj Tevasvi, MD. Making online decisions inflammatory dermatoses. 8th World Congress of Teledermatology, Skin Imaging and AI in Skin diseases – November 2020