AITA for switching my skincare and unintentionally making my roommates face flare up?

A 21-year-old woman with normal skin likes to experiment with different skincare products. Her 20-year-old roommate has extremely sensitive skin and is usually very careful about what she puts on her face. They share a bathroom with clearly divided sinks.

After noticing her pricey cleanser disappearing much faster than usual, she discovered her roommate had been using it daily without asking. When confronted, the roommate brushed it off. So the woman replaced it with a new product from a different brand—only for the roommate to wake up with an angry, inflamed rash the next morning and accuse her of deliberate sabotage.

‘AITA for switching my skincare and unintentionally making my roommates face flare up?’

The trouble began when the woman noticed her cleanser vanishing quickly:

She addressed the issue directly:

Later, the woman decided to try something new:

The reaction came the next morning:

Shared living spaces require mutual respect for personal property, especially when it comes to health-related items like skincare. Using someone else’s products without permission is a boundary violation—doubly so when the person knows they have sensitivities. The roommate’s failure to ask, replace what she used, or check labels before using a new item shifts responsibility squarely onto her.

Changing personal products in your own space is a normal part of self-care. No one is obligated to announce routine updates or act as a personal dermatologist for others. The dramatic shift to accusations of sabotage reflects deflection—a common tactic when someone feels caught in the wrong.

Dermatologists frequently emphasize that individuals with reactive skin bear primary responsibility for their own product choices. Dr. Shereene Idriss, a board-certified dermatologist, has noted in interviews that “people with sensitive skin must read ingredient lists every single time—formulations change, even within the same brand.”

The healthiest path forward is clear communication of boundaries (“please don’t use my products”) and, if needed, physical separation of items. Persistent disrespect for personal space and property often signals deeper incompatibility as roommates.

Check out how the community responded:

The online crowd overwhelmingly sided with the original poster as NTA, pointing out the roommate’s entitlement and lack of caution:

Many highlighted the theft and hypocrisy:

Others emphasized personal responsibility:

This skincare mix-up has everyone debating roommate etiquette, personal property, and responsibility for one’s own sensitivities.

What do you think about shared spaces and using others’ belongings? If someone repeatedly took your things without asking, how would you handle it? And when an accident happens because of that, who bears the blame? Share your experiences below!