Hi Sandeep, firstly PUVA therapy is not a LASER therapy. It is a Ultraviolet A based photochemotherapy where in patient is advised to take a tab of psoralen followed by exposure of UV A lights in a closed chamber. It is a good treatment however having side effects. So again now doctors prefer giving narrow band ultraviolet b therapy. It is again exposure of ultraviolet B lights in a closed chamber and no drug is taken(psoralens) prior to light exposure. Practically it is devoid of many side effects commonly seen with Puva and therefore considered more efficacious and better than Puva. These therapies are given 2-3 times in a week on alternate days. Psoriasis can be managed with topical and oral medicines. We prefer light based therapy only if disease is generalised or refractory to medicines. In your case the modality can only be decided after determining the severity and extent of lesions. Persistence of few lesions or recurrence of psoriasis every year doesnt indicate that you need to go for light based tharapies. TAke care