Skin Diseases Information Center
Poison Ivy is known to cause severe inflammation of the skin which is medically referred to as contact dermatitis. The leaf of the plant when it comes in contact with the skin is responsible for causing instant irritation and inflammation. What makes Poison Ivy dangerous is the sap of the plant. It contains oil like substance called urushiol. When this sticky oil like substance touches the skin it results in inflammation, irritation and formation of rashes at the point of contact.
Blood clot is something which will always form whenever there is a wound or break in a skin. If a blood clot does not form, then the individual can lose his or her life due to excessive bleeding. In the case of a bruise, a blood clot forms outside the vessels, under the skin and stops the bleeding and thus plays an important part in the healing process after an injury. Coming to the question of whether rubbing on the bruise can cause a deep venous thrombosis or a blood clot, then the answer is rubbing on the wound cannot cause a deep venous thrombosis (DVT), but the actual injury which caused the bruise may definitely cause a DVT.
Once the bruise starts healing, the body starts absorbing the leaked blood which causes a change in the appearance and color of the bruise. The color changes that the area of the bruise has during various stages of healing are because of breakdown of proteins within the while blood cells. It normally takes about three weeks for the bruise to completely go away, although it may take somewhat longer for bruises that occur in the upper or lower extremities to heal.