Fixed drug eruption and generalised erythema following etoricoxib.

recommended quantity makes the sunscreen less effective. Excessive quantity makes the sunscreen more expensive, and also more uncomfortable. We calculated that the mean cost of 1 ml of sunscreen of 10 brands is approximately Rs. 3 to 4. It is more expensive if the patient uses the sunscreen repeatedly, or in excessive quantity. We recommend 1 ml of sunscreen for the female, and 1.5 ml for the male during each application. It is possible to calculate the sunscreen to be applied over any given area e.g., arm, back, etc. Figure 2 shows how a string is placed over the forearm. The same length of thread can be arranged in form of a circle. Once the area is determined, the amount of sunscreen can be easily calculated. This method actually measures the perimeter of the skin, and assumes it to be a circle. In general, an oval surface would encompass a lesser area than a circular surface of the same perimeter. This method would thus result in a larger calculated area than the actual, and in the case of the forearms, we would use more sunscreen than is necessary. However, this may not make a significant difference.