First off the sunscreen must be powerful enough to protect the skin and lips from the damaging rays of the sun. It should have a high rating to do any good for the person’s skin. It should block out the rays of the sun and reflect them off the skin. The sunscreen will prevent the radiation from the sun’s rays from absorbing into the skin. This will prevent skin cancer from the developing on the skin. It will also allow the skin to tan but it will tan gradually and safely. There are a lot of good sunscreens on the market that will meet all of these requirements. You will want to buy a sunscreen that will not make your skin react negatively to it. You do not want the skin to bubble or blister from using the sunscreen. You must have a strong rated SPF rated sunscreen if it will give you any decent protection.