Applicator with in-line sensor

A system for applying a formula, the system comprising:

• an applicator, comprising:
• a body;
• one or more reservoirs inside the body, wherein the one or more reservoirs are configured to hold one or more formulas;
• an applicator surface coupled to the body, wherein the applicator surface is configured to apply the one or more formulas;
• one or more sensor modules, comprising:
• one or more condition sensors located on the applicator, the one or more condition sensors configured to detect a condition of a portion of skin, before one or more formulas is applied to the portion of skin;
• a position sensor configured to map the skin as the applicator surface moves across the skin;
• a camera configured to take one or more images of the skin as a user moves the applicator over the skin;
• a base device, comprising:
• a base device processor configured to:
• receive the condition from the one or more sensors;
• and
• direct the applicator to apply one or more treatments onto the portion of skin based on the condition;
• and
• a communication device, communicatively coupled to the base device, wherein the communication device is configured to:
• display the one or more images of the skin;
• highlight one or more portions of the skin in the one or more images of the skin;
• propose one or more treatments to be applied to the one or more portions of the skin;
• and
• store a user history, wherein the user history includes information relating to a history of the one or more treatments, a location where one or more treatments have been applied, a location where one or more treatments have not been applied, or a condition of one or more portions of the skin.