[1]: 598 The reactive involuting type, reactive Angioendotheliomatosis is an rare cutaneous condition characterized histologically by a dense proliferation of small capillaries, and occurs in people with various diseases including subacute bacterial endocarditis and end-stage atherosclerotic disease.

These people present with various skin lesions and rashes - most commonly on the thighs.

Treatment aimed at the underlying condition hastens the resolution of the lesions.

It progresses rapidly through involvement of multiple body systems and mortality occurs in less than a year from the initial diagnosis.

[1]: 598 Proliferating angioendotheliomatosis may be divided into two types:[2] In few cases palliative chemotherapy is effective.