Massage is not recommended for certain people: infectious skin disease, rash, or open wounds; immediately after surgery; immediately after chemotherapy or radiation, unless recommended by your doctor; people with osteoporosis should consult their doctor before getting a massage; prone to blood clots, there is a risk of blood clots being dislodged. If you have heart disease, check with your doctor before having a massage; pregnant women should check with their doctor first if they are considering getting a massage. Massage in pregnant women should be done by massage therapists who are certified in pregnancy massage; massage should not be done directly over bruises, inflamed skin, unhealed wounds, tumors, abdominal hernia, or areas of recent fractures.
The following information was taken from http://www.happymassage.com/wiki/Deep_Tissue_Massage