<unk>  are a common and nonspecific medical sign; however, the underlying mechanism commonly involves one of: *Platelet disorders (thrombocytopenic<unk>  *Primary thrombocytopenic<unk>  *Secondary thrombocytopenic<unk>  *Post-transfusion<unk>  *Vascular disorders (nonthrombocytopenic<unk>  *Microvascular injury, as seen in senile (old age)<unk> , when blood vessels are more easily damaged *Hypertensive states *Deficient vascular support *Vasculitis, as in the case of Henoch–Schönlein<unk>  *Coagulation disorders *Disseminated intravascular coagulation (DIC) *Scurvy (vitamin C deficiency) – defect in collagen synthesis due to lack of hydroxylation of procollagen results in weakened capillary walls and cells *Meningococcemia *Clumping fibrillary protein deposits caused by Amyloidosis *Cocaine use with concomitant use of the one-time chemotherapy drug and now veterinary deworming agent levamisole can cause<unk>  of the ears, face, trunk, or extremities, sometimes needing reconstructive surgery. Levamisole is purportedly a common cutting agent. *Decomposition of blood vessels including<unk>  is a symptom of acute radiation poisoning in excess of 2 Grays of radiation exposure. This is an uncommon cause in general, but is commonly seen in victims of nuclear disaster. Cases of psychogenic<unk>  are also described in the medical literature, some claimed to be due to "autoerythrocyte sensitization". Other studies suggest the local (cutaneous) activity of tissue plasminogen activator can be increased in psychogenic<unk> , leading to substantial amounts of localized plasmin activity, rapid degradation of fibrin clots, and resultant bleeding. Petechial rash is also characteristic of a rickettsial infection.
Purpura
Rhagades
Rose spots
Petechia
Nevus oligemicus
Calcinosis cutis
Granulomatous slack skin
Nevus anemicus