When the horse's skin dries, it cracks. And often when it cracks, it itches and / or it becomes infected.
The skin cracks, initially microscopically and then increasingly visible. Dander appears, then crusts. The hydration is bad and the bacteria then have the door open. This loss of hydration is often the starting point for a large number of pathologies: itching, mud fever, etc.
1- Hydrate areas sensitive to these problems by external means (balms, specific lotions)
2- it is crucial to hydrate internally. All the feeds given do not provide the desired internal hydration and often have low content, notably in Omega 3 and 6. The distribution of hay containing few varieties of species does not compensate for this deficiency either.
Prefer therefore foods rich in omega and varied hay (many different herbs) which will make up for a good number of deficiencies. It's simple and often very effective!