die Gänsehaut
goosebumps
A reaction of the skin in which the hairs stand up and small bumps form due to cold, fear, or strong emotions.
Bei dem unheimlichen Geräusch bekam ich sofort eine Gänsehaut.
At the eerie noise, I immediately got goosebumps.

goosebumps
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goosebumps
A reaction of the skin in which the hairs stand up and small bumps form due to cold, fear, or strong emotions.
Bei dem unheimlichen Geräusch bekam ich sofort eine Gänsehaut.
At the eerie noise, I immediately got goosebumps.

The word is made up of 'Gänse' (plural of goose) and 'Haut' (skin). The name comes from the fact that human skin with the small bumps resembles the skin of a plucked goose.
Allein bei dem Gedanken an die Prüfung bekomme ich eine Gänsehaut.
Just thinking about the exam gives me goosebumps.
'Gänsehaut' is almost always used with the verbs 'bekommen' (to get), 'kriegen' (to get, more colloquial), or 'haben' (to have).
Ich habe eine Gänsehaut, weil es hier so kalt ist.
I have goosebumps because it is so cold here.
To state the reason for the goosebumps, German often uses the preposition 'vor' + dative with feelings, or 'wegen' + genitive/dative with a cause.
Die Kinder zitterten vor Kälte und hatten am ganzen Körper Gänsehaut.
The children were shivering from the cold and had goosebumps all over their bodies.
shower / shiver
'der Schauer' and 'die Gänsehaut' can both occur because of cold, fear, or strong emotions. 'der Schauer' describes more the brief feeling that runs through the body, meaning a chill or shiver. 'die Gänsehaut' describes the visible reaction of the skin when the tiny hairs stand up. You can have both at the same time, which is why the words are easy to confuse. If you mean the inner feeling, 'Schauer' fits. If you mean the skin reaction, 'Gänsehaut' is more precise.

Vor Kälte bekam Lena Gänsehaut an den Armen.
Lena got goosebumps on her arms from the cold.
Bei der unheimlichen Musik lief ihr ein Schauer über den Rücken.
The eerie music sent a shiver down her spine.