Patient Study to Evaluate the Safety and Emollient Performance of Doublebase Once in the Treatment of Ichthyosis

Ichthyosis patients registered on the ISG/MHF database or patients responding to information on the websites will be advised about the study and asked if they maybe interested in trying Doublebase Once. Any patients interested in taking part will then be asked to register, by completing a short questionnaire that will be used as a pre-screen tool to exclude any patients who are ineligible for the study.

Patients will then be provided with the Patient Information Sheet (PIS) to read and then complete a consent questionnaire confirming their agreement to participate in the study. Once consent has been obtained, patients will then complete a screening questionnaire. ISG/MHF and the Sponsor will require access to personal information such as email addresses (for sending the questionnaires and safety monitoring) and home addresses (for sending the packs of Doublebase Once), but these details will be used solely for the purpose of the study.

If all screening questions are completed and the patient is eligible in accordance with the inclusion and exclusion criteria, the patient will then be sent two pump packs of Doublebase Once 500g.

On receipt of their pack(s) of Doublebase Once (Day 0), the patients will be asked to read through all the information provided and to complete an online questionnaire and, if they agreed at consent, they will be asked to photograph one area of their ichthyosis that will be treated with the product and upload to the database alongside their questionnaire. Guidance on taking the photos will be provided in the questionnaire with regards to, lighting, location, distance, angle of taking photographs and background. This questionnaire and image(s) will form the baseline 'before using Doublebase Once' and there will be some questions to be completed immediately after first use of the product.

Patients will then be asked to use Doublebase Once, as per the package leaflet for approximately 4 weeks, once daily (unless they need to use it more often) and on one area affected by ichthyosis, instead of their usual leave-on emollient. If, during the study patients find that they like using Doublebase Once, they can use the product on all affected areas. Patients will also be asked to use Doublebase Once instead of their usual wash product. If patients do not want to use Doublebase Once instead of their usual wash products, they will be asked to continue to use their usual products.