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Welcome to the forum, you might want to have a look at the following FAQ which explain where everything is
Welcome to Benefits and Work In case you are not aware, your real name appears to be showing in the forum, if you want to change this then follow the instructions in the following FAQ
My full name is showing, how can I stop it?
I can't tell you that you do not need to contact the DWP but they are usually not bothered if a claimant fails to report a deterioration in their conditions.
The big question to ask yourself is whether this change would reasonably result in a higher award, if it does then consider contacting the DWP.
Write a letter to the DWP office dealing with your claim telling them of the change, if you can afford it then send it by tracked post so that you have proof of delivery.
Doing so will result in a new PIP2 being sent to you to complete and almost certainly a face to face assessment, the resulting Decision will replace your current award.
Gordon