7) Drugs:
Many drugs can cause bruising and it is considered one of the most common causes of easy bruising and spontaneous bleeding. Drugs can cause bruising as an exaggeration of its normal desired effect such as Aspirin is an antiplatelet drug that helps prevent the formation of blood clots in hypertensive patients and those with recurrent blood clots. It normally increases bleeding time, but in some cases, it can cause prolonged bleeding beyond the desired effect.
Another class of drugs with a similar action is anticoagulants. These drugs act on the coagulation cascade mostly through the inhibition of single or multiple coagulation factors. The most commonly used of these drugs are Heparin and Warfarin. Heparin is taken as an injection and warfarin as tablets. They rarely cause spontaneous bleeding unless taken in great excess but can cause easy bruising. Both of these drugs are monitored by special tests to assess the degree of anticoagulation achieved and to make sure that it never exceeds or falls below the desired value.