Change of circumstance

Usually when reporting changes they send you a PIP2 form which is the long form you received when you first applied. You can see a sample of it here https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/1179475/pip2-form-and-information-booklet.pdf

If it’s a worsening of condition you have. When reporting changes you need to make sure it’s possible to score more points needed for a higher award. A worsening of condition doesn’t automatically entitle you to more points for a higher award.