Yes, there can be temporary side effects associated with laser hair removal. Some people experience raised, red and irritated skin similar to a mild sunburn. This will subside within a few hours or more rarely a few days. If your technician is qualified and experienced, permanent damage is very rare.
Skin discolouration can occur for a variety of reasons such as laser on tanned skin, hormonal imbalances or over treatment. It’s very unlikely but blistering or burning can occur.