The main reasons for not fitting the base makeup are as follows:
1. Poor skin condition: When the skin is dry, rough, or peeling, makeup is difficult to adhere to the skin. This is usually caused by insufficient skin moisture or improper maintenance.
2. Excessive facial oil: Excessive facial oil may cause makeup to not fit properly, making it easy for the makeup to slip off. This usually occurs in people with oily or combination skin.
3. Improper selection of cosmetics or incorrect makeup steps: Choosing cosmetics that are not suitable for one's skin type, or not following the correct steps when applying makeup, may result in a base makeup that does not fit properly. For example, using overly heavy or insufficiently moisturizing base makeup products, or not doing sufficient moisturizing and oil control work before applying makeup.