What does the bump in the belly button suggest? Can it be picked? After reading the increase knowledge 
What does the bump in the belly button suggest? Can it be picked? After reading the increase knowledge What does the bump in the belly button suggest? Can it be picked? After reading the increase knowledge What does the bump in the belly button suggest? Can it be picked? After reading the increase knowledge What does the bump in the belly button suggest? Can it be picked? After reading the increase knowledge What does the bump in the belly button suggest? Can it be picked? After reading the increase knowledge What does the bump in the belly button suggest? Can it be picked? After reading the increase knowledge Resources:
1. Pick the belly button, will it leak? Popular Science China.2019.07.18
2. Yang Jie. Can you pick the belly button? Health Management.2017.02
