Kaposi sarcoma and Bacillary angiomatosis cause Blanchable lesions?

[Sharkanatomist]

Blood cells are still in vessels so shouldn't they be blanchable?

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[Dr. EB]

When you think about blanchable vs non-blanchable lesions, think about it as a spectrum. Lesions in both cases could blanch or not blanch, its not pathognomic in either case. These are abnormal, poorly formed blood vessels and it makes sense they would often break and bleed superficially (making them often non-blanchable).