If you have zit on lip, there are many possibilities as to why it occurs. The following are reasons why they occur.
One of the main causes of zit on lip is cold sore. This is an infection which is caused by a herpes virus. You will find small, red sore bumps which start to appear on the lip line or the corner of the mouth. The zits could appear on the upper or lower lip. If they are not treated on time, they enlarge and become more visible.
There is an allergic reaction which may occur on the lip. Not all the lipstick brands you use are suitable for the skin on the lips. They sometimes cause an allergic reaction, leading to itching. A red bump appears and before long, you have a zit on lip. This could keep growing and in time, you could have a large one that is sore to touch.
The kind of toothpaste you use has bearing to whether you will have zit on lip or not. The ones which have SLS in them are not recommended as they irritate the lips. Be sure only to use the SLS-free brands and preferably, the white parts of the tooth paste. The gel of the toothpaste has this chemical.
Forgetting to remove make up at night could contribute to this problem. The longest you should have a makeup on the lip is a day. Before sleeping, ensure that you remove it. This will prevent the build up of the chemical on the lip.
The use of harsh brands of makeup has been shown to lead to the problem. It is advisable that you use the makeup that is tested and proven to be of high quality. Avoid the poor quality ones so as not to suffer from this problem.