This effect can occur particularly on sensitive or already stressed scalps. In most cases, the wrong Thymuskin serum was chosen. The Sensitive Serum and the Forte Serum are especially suitable for this purpose. Consistent continued use is important. To support the scalp, a moisturizing treatment such as Thymuskin Balm Conditioner or Thymuskin Hydro Gel is recommended. Make sure that care products are not applied immediately before the serum so that the active ingredients can be absorbed optimally.