If you have long sharp nails & scratch a lot, can this cause petechia? thanks.

Sort of: You could excoriate your skin with sharp nails and that may look like petechiae. Long nails do not cause a bleeding disorder, per se. For good health - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex.