It is unlikely that kissing your boyfriend caused the pimples directly. However, there could be some factors at play here that might explain the appearance of the pimples.
Skin Sensitivity: Everyone's skin is different, and some people may be more sensitive to certain substances, including the oils or products their partner uses on their skin or even the natural oils on their partner's skin. These oils can potentially clog pores and lead to pimples.
Allergies: It is possible that you may have developed an allergic reaction to something your boyfriend uses, such as lip balm, certain foods, or even aftershave or cologne.
Hormonal Changes: Hormones can play a significant role in the development of pimples. Changes in hormone levels can occur due to stress, menstrual cycle variations, or even just being in a new relationship, which can affect your skin.
Coincidental Timing: It's also essential to consider the possibility that the appearance of pimples around your lips might be coincidental and not directly related to kissing your boyfriend. Other factors like diet, hygiene habits, or environmental conditions could contribute to the breakout.
If the pimples persist or become painful, it's a good idea to consult a dermatologist or a healthcare professional for a proper evaluation. They can examine your skin, ask about any recent changes or new products you've been using, and help you identify the cause of the pimples and provide appropriate treatment if necessary.
In the meantime, maintaining good skincare practices such as gentle cleansing, using non-comedogenic (non-pore-clogging) products, and keeping your hands away from your face can be helpful in preventing further breakouts. And try not to stress too much; stress can also impact your skin's condition.