Please recommend a good dermatologist in Dongtan.

I used to take care of my skin, but as I got older, freckles started appearing on my skin.

I applied sunscreen well though ㅠㅠ

I haven't found a good dermatologist yet.

Please recommend something

Condition 1. It must be effective.

Condition 2. Dongtan 1 or Dongtan

Condition 3: A place where the cost is cheaper than expected