A lot of blood mole grew on arm what reason is

A lot of blood nevus on the arm may be allergic purpura, cherry shaped hemangioma, vascular nevus and other reasons caused.

1, allergic purpura

allergic purpura may be related to infection, drugs and genetic factors, easy to cause tissue and organ damage, can appear in the limbs and buttocks purple papules, similar to the appearance of blood nevus.

2, cherry shaped hemangioma

cherry shaped hemangioma may be related to aging, gene mutation and other factors, due to subcutaneous capillary proliferation or expansion, can make the upper limbs and trunk parts appear bright red or purple papules or nodules, thus mistaken for blood nevus.

3, vascular nevus

vascular nevus may be due to hemangioma, vascular malformation and other reasons caused, due to vascular network proliferation, can appear in the limbs, neck and other parts of erythema, appearance similar to blood nevus.