You need to talk to a doctor ASAP to rule out issues such as a blood disorder....
Welcome to the MedHelp forum!
Are you on any medications like anticoagulants, blood thinners or birth control pills. The commonest cause is OCPs or birth control pills. Check with your doctor if you are on any of these.
The other possible reasons are low platelet count, clotting disorders, fragile spider veins, deep vein thrombus, deficiency of Vitamin B12, folic acid, or Vit K, a liver disease or certain cancers. It could also be due to pressure urticaria.
You need a comprehensive investigation taking all these points in consideration. It is difficult to comment beyond this without examining. Please discuss this with your doctor and get yourself investigated accordingly.
Hope this helps. Take care!