hi and welcome,
The condition you have mentioned is definitely normal and it clearly indicates eruption of the wisdom tooth.
Wisdom tooth is the last tooth to erupt in the oral cavity and it normally erupts in the age group of 18 to 27 years or sometimes in later part of life.
wisdom tooth eruption
is often associated with gum swelling , pain and discomfort , difficulty in opening the mouth.
the area is more susceptible to infection as it is difficult to clean ,deposition of food debris and bacterial plaque
may lead to inflammation of the overlying mucosa known as pericoronitis
i suggest you to maintain good oral hygiene
by using cleaning the area regularly
using antiseptic mouthwash like chlorexidine or lukewarm saline water for mouth gargling helps prevent infection.
i hope this helps,